IF you have an SDG&E digital meter for Solar, but not ToU (no Second Meter with subtractive TOU billing), then you probably have the iTron OpenWay "NET" meter?
Unfortunately, the customer password for this meter is still unknown (to me).
Each ANSI meter has three logins:
Customer
Reader
Technician/Installer/Master
The Customer password of the SDG&E GE Kv2c meters is well-known and universal. (as is the Reader password, which can't do much more)
The Customer password of the iTron meters hasn't been disclosed. Unless you can get SDG&E to tell you what it is, you might be out of luck altogether, regardless of data interface or software.
The meter does store the interval data for the last 60 seconds, last hour, and so on. I'm reading the meter every 30 seconds (approximately) and getting one-minute resolution on demand and totals. It has quite a bit of precision.
You can see the Total generation/consumption, and the usage in each of the three time spans. For example:
Code:
2011-05-25 08:06:02 DST Wed T:143.901242 A:0.873748 B:1.167760 C:141.859735 Now:12.45W
2011-05-25 08:07:06 DST Wed T:143.901450 A:0.873748 B:1.167968 C:141.859735 Now:12.45W
2011-05-25 08:08:02 DST Wed T:143.901657 A:0.873748 B:1.168175 C:141.859735 Now:12.45W
I've done 100% of my charging in super-off-peak. The Blink's idle standby power accounts for the Peak/Off-Peak (A/B) usage.
It's also important to make sure the Blink or Leaf timer agrees precisely with the meter.
If the car starts charging one minute early, it will tally in the B rate, of course.
I set the timer to :10 past the hour to avoid this.
The format of the messages, protocol (encoding, CRC and handshake) are all documented in ANSI specifications.. See ANSI C12.18 and C12.21, for example.
The particular RS-232 to Optical adapter has zero influence on the protocol.. most of the inexpensive ones are direct pass-through, baud rate and all. (The bluetooth/wifi adapters have more smarts, of course.)
)
